What is the meter of poem If by Rudyard Kipling?

The meter of Rudyard Kipling's "If" is anapestic tetrameter, meaning that each line has four metrical feet, each consisting of two unstressed syllables followed by a stressed syllable.

Here's an example from the first line:

If you can keep your head when all a-

round you are losing theirs and

blaming it on you...

This pattern is consistent throughout the poem, giving it a strong, measured rhythm that emphasizes the importance of the advice being given.